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Extending R-32 scroll chiller energy savings

Carrier has introduced high-performance heat recovery and free cooling options to its AquaSnap 30RBP air-cooled scroll chiller range on lower global warming potential (GWP) R-32 refrigerant, providing even greater energy savings and further reducing operating costs for end users.

Carrier was the first European manufacturer to introduce a fully optimised scroll chiller range on R-32. AquaSnap units also have an outstanding seasonal energy performance ratio (SEER) for cooling of up to 6.62, reducing indirect greenhouse gas emissions resulting from energy use. The latest heat recovery and free cooling options extend energy savings, further reducing greenhouse gas emissions over the lifetime of the equipment.
The heat recovery system enables chillers to produce domestic hot water up to 80degC, while continuing to provide cooling, useful for applications such as hotels, hospitals and industrial processes requiring hot water. The free cooling option makes use of favourable ambient and load conditions, harnessing free cooling from the environment to augment or replace mechanical cooling via the chiller's compressors, reducing energy consumption and running costs.
Two versions of free cooling are available. Partial free cooling is designed for applications with a variable primary cooling load, such as offices and healthcare, which may also have a constant residual cooling need. Examples include computer suites or scanner facilities. The total free cooling option is designed for applications with a constant cooling need throughout the year, such as industrial processes and data centres.
'Heat recovery and free cooling can deliver significant energy savings for most applications,' said Eric Pollet, marketing product manager, chillers and heat pumps, Carrier HVAC. 'Free-cooling is particularly valuable in higher latitudes, where cooler climates offer the greatest opportunities for harnessing natural ambient conditions rather than relying on mechanical cooling. Under these conditions, it is possible for free cooling to meet most of an application's cooling needs, delivering huge potential savings for the end user.'
Carrier's hydronic-based free-cooling system automatically activates when the outdoor air temperature drops 1degC below the chiller's return water temperature, harnessing the full free cooling opportunity and maximising energy savings. For example in Berlin, the hydronic free cooling potential is 50 to 95% of annual chiller run-time, depending on the application. In more northern locations, the potential free cooling opportunity is even greater. 
If free cooling is not sufficient to meet requirements, a mixed mode – using both free cooling and mechanical cooling – is automatically activated, ensuring the cooling needs of mission critical applications are always met.
Energy efficient solutions like the AquaSnap scroll chiller with heat recovery and free cooling support Carrier’s 2030 Environmental, Social and Governance (ESG) Goal of reducing its customers’ carbon footprint by more than 1 gigaton.


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